Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 2,043.7	$ 2,407.8
Short-term investments	613.1	441.5
Accounts receivable, net of allowances	532.6	438.4
Deferred tax assets, net	151.4	172.6
Prepaid expenses and other current assets	199.2	140.4
Total current assets	3,540.0	3,600.7
Property and equipment, net	839.0	811.9
Long-term investments	1,015.2	988.1
Restricted cash and investments	94.4	106.4
Purchased intangible assets, net	131.2	128.9
Goodwill	4,057.8	4,057.8
Other long-term assets	152.8	138.3
Total assets	9,830.4	9,832.1
Current liabilities:
Accounts payable	223.8	209.3
Accrued compensation	204.5	279.3
Accrued warranty	29.4	29.7
Deferred revenue	774.7	693.5
Other accrued liabilities	191.3	210.2
Total current liabilities	1,423.7	1,422.0
Long-term debt	999.2	999.2
Long-term deferred revenue	206.0	229.9
Long-term income taxes payable	87.1	112.4
Other long-term liabilities	58.0	69.1
Total liabilities	2,774.0	2,832.6
Commitments and contingencies
Juniper Networks stockholders' equity:
Convertible preferred stock, $0.00001 par value; 10.0 shares authorized; none issued and outstanding	0	0
Common stock, $0.00001 par value; 1,000.0 shares authorized; 510.9 shares and 508.4 shares issued and outstanding as of March 31, 2013 and December 31, 2012, respectively	0	0
Additional paid-in capital	9,923.1	9,905.7
Accumulated other comprehensive (loss) income	(5.2)	4.7
Accumulated deficit	(2,862.0)	(2,911.4)
Total Juniper Networks stockholders' equity	7,055.9	6,999.0
Noncontrolling interest	0.5	0.5
Total stockholders' equity	7,056.4	6,999.5
Total liabilities and stockholders' equity	$ 9,830.4	$ 9,832.1